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Unformatted text preview: we find that this represents the sum of two states, one with momentum , and the other with momentum . The first one describes a beam of particles going to the right, and the other term a beam of particles traveling to the left. Let me concentrate on the first term, that describes a beam of particles going to the right. We need to define a probability current density. Since current is the number of particles times their velocity, a sensible definition is the probability density times the velocity, (6.2) This concept only makes sense for states that are not bound, and thus behave totally different from those I discussed previously....
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- Fall '10